The Kannada dialect notable for its retention of Old Kannada features:

The correct answer is B) Havyaka.

Havyaka is a dialect of Kannada spoken by the Havyaka people of Karnataka, India. It is notable for its retention of Old Kannada features, such as the use of the retroflex /ḷ/ sound and the absence of the contrast between short and long vowels.

Hubli Kannada is a dialect of Kannada spoken in the Hubli-Dharwad region of Karnataka. It is similar to Standard Kannada, but with some differences in pronunciation and vocabulary.

Mysore Kannada is a dialect of Kannada spoken in the Mysore region of Karnataka. It is similar to Standard Kannada, but with some differences in pronunciation and vocabulary.

Mangalore Kannada is a dialect of Kannada spoken in the Mangalore region of Karnataka. It is similar to Standard Kannada, but with some differences in pronunciation and vocabulary.

Here is a table showing the features of each dialect:

| Dialect | Features | |---|---| | Havyaka | Retention of Old Kannada features, such as the use of the retroflex /ḷ/ sound and the absence of the contrast between short and long vowels | | Hubli Kannada | Similar to Standard Kannada, but with some differences in pronunciation and vocabulary | | Mysore Kannada | Similar to Standard Kannada, but with some differences in pronunciation and vocabulary | | Mangalore Kannada | Similar to Standard Kannada, but with some differences in pronunciation and vocabulary |